Diamondback Bicycles 2015 Axis Comp Hard Tail Complete Mountain Bike Hand built 6061-t6 aluminum alloy hard tail frame is simple and efficient Custom formed and butted tubing balances strength and weight savings 27.5" Wheels roll well over obstacles and offer quick handling Rockshox 100mm suspension fork helps tame the trail Sram 2x10-speed drivetrain delivers an efficient range of gears